Side repair plate mounting device and repair method for large structural part lifting arm

Abstract

The invention discloses a side repair plate mounting device and repair method for a large structural member lifting arm, the side repair plate mounting device comprises a fixing frame, a supporting frame and a positioning frame, the fixing frame comprises a fixing rod and a connecting rod, the connecting rod is vertically fixed on the fixing rod, the fixing rod is horizontally placed on the lifting arm, and the supporting frame is arranged on the fixing rod. At least one connecting rod is arranged on the two sides of the lifting arm, the supporting frame is fixedly connected to the connecting rods, and the positioning frame is fixedly connected with the connecting rods and the supporting frame; it is guaranteed that the side repairing plate is accurately placed on the lifting arm, so that the side repairing plate and the arc repairing plate stably machine and repair the R-angle section, prone to cracking, of the lifting arm, and the service life of the repaired lifting arm is prolonged; and the conditions of resource waste caused by replacement of the lifting arm and short service life caused by only welding crack repair are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of large equipment repair, and in particular to a side repair plate installation device and a repair method for a lifting arm of a large structural component. Background Art

[0002] The lifting arm, a key large structural component of the continuous casting machine's ladle turret, is installed on the center line of the casting machine and supported by a spherical joint bearing on the bracket. The lifting arm uses a parallel four-bar linkage to ensure the translation and lifting of the ladle. Long-term load use will cause cracks to appear on the crossbeam of the lifting arm box, a large structural component. The cracks will continue to expand over time, making it impossible for the lifting arm to operate normally.

[0003] The existing repair method generally adopts on-site crack welding repair. Although the repair weld can be guaranteed to be defect-free when the crack is repaired by welding, the stress concentration can be reduced by post-weld heat treatment, and the drawing size and precision size can be restored by online manual grinding, so that it can be delivered to production in time. However, for cracks at the R corner of the lifting arm of a large structural part, after being repaired by welding, various mechanical properties cannot meet the long-term use requirements of the lifting arm's translation and lifting due to the influence of welding repair. In order to meet long-term use, the lifting arm generally needs to be replaced. However, the lifting arm is large in size, and there are certain difficulties in disassembly, lifting and transportation. In addition, the replacement of local components is not suitable for the assembly of new and old equipment, which is also prone to waste a lot of procurement costs.

[0004] In view of the above-mentioned defects, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the Invention

[0005] To address the above technical deficiencies, the present invention adopts a technical solution that provides a side repair plate installation device for a lifting arm of a large structural member. The lifting arm is provided with a first fitting surface and a second fitting surface. The first fitting surface and the second fitting surface transition through the circular arc of the R-angle segment to be repaired. The side repair plates are provided on both sides of the circular arc repair plate and are fitted and connected to the vertical side surfaces of the lifting arm and cover the side surfaces of the R-angle segment.

[0006] The side repair plate installation device for the lifting arm of a large structural member includes a fixing frame, a supporting frame and a positioning frame, the fixing frame includes a fixing rod and a connecting rod, the connecting rod is vertically fixed to the fixing rod, the fixing rod is horizontally placed on the lifting arm, and at least one connecting rod is provided on both sides of the lifting arm, the supporting frame is fixedly connected to the connecting rod, and the positioning frame is fixedly connected to the connecting rod and the supporting frame;

[0007] A side repair plate is provided on both sides of the lifting arm, and a positioning frame is provided on both sides of the corresponding lifting arm. The positioning frames are arranged in a one-to-one correspondence with the side repair plates, and the positioning frames are used to perform precise positioning operations on the corresponding side repair plates before welding.

[0008] Preferably, the support frame includes a support rod and a reinforcement rod, the support rod is vertically fixed on the connecting rod, the reinforcement rod is arranged below the support rod and both ends of the reinforcement rod are respectively connected to the support rod and the connecting rod.

[0009] Preferably, the positioning frame includes a bottom positioning plate, which is horizontally arranged on the support rod and is arranged corresponding to the bottom of the side repair plate, for supporting and positioning the lower edge of the side repair plate.

[0010] Preferably, the positioning frame also includes a first side positioning plate and a second side positioning plate, the first side positioning plate and the second side positioning plate are respectively arranged on both sides of the side repair plate, the first side positioning plate is fixedly arranged on the connecting rod, the second side positioning plate is fixedly arranged on the bottom positioning plate, and the first side positioning plate, the second side positioning plate and the bottom positioning plate are all arranged vertically, and the first side positioning plate and the second side positioning plate respectively perform positioning operations on both sides of the side repair plate.

[0011] Preferably, the first side positioning plate and the second side positioning plate are arranged in parallel.

[0012] Preferably, the positioning frame also includes a top pressure positioning plate, which is vertically fixed to the bottom positioning plate, and the top pressure positioning plate is vertically arranged to the fixing rod. An adjustment gap is arranged between the top pressure positioning plate and the lifting arm, and the side repair plate is arranged between the top pressure positioning plate and the lifting arm. A first adjustment hole is provided on the top pressure positioning plate, and the first adjustment hole is set as a threaded hole. A first mounting push rod is connected to the inner thread of the first adjustment hole. The first mounting push rod is vertically arranged to the top pressure positioning plate, and one end of the first mounting push rod can be pressed against the side repair plate by rotating the first mounting push rod.

[0013] Preferably, at least two first adjustment holes are provided on the same pressing and positioning plate, and the first mounting push rods in the two first adjustment holes are arranged in parallel.

[0014] Preferably, a second adjustment hole is provided on the second side positioning plate, and the second adjustment hole is configured as a threaded hole. A second mounting push rod is threadedly connected to the second adjustment hole, and the second mounting push rod is vertically arranged to the second side positioning plate. By rotating the second mounting push rod, one end of the second mounting push rod can be pressed against the side edge of the side repair plate.

[0015] and a support frame and a support frame attached to the side panel of the lifting arm are fixed to the support frame, and the support frame and the support frame are fixed to the support frame.

[0016] Compared with the prior art, the beneficial effect of the present invention is that: the present invention ensures that the side repair plate is accurately placed on the lifting arm, so that the side repair plate and the arc repair plate can stably process and repair the R-angle section of the lifting arm that is prone to cracks, so as to increase the service life of the lifting arm after repair, avoid the waste of resources caused by the replacement of the lifting arm and the low service life caused by only welding crack repairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional structural view of the side repair plate installation device for the large structural member lifting arm during installation;

[0018] Figure 2 A front view of the structure of the side repair plate installation device for the large structural member lifting arm during installation;

[0019] Figure 3 A three-dimensional structural view of the side repair plate installation device for the large structural member lifting arm when positioning the side repair plate;

[0020] Figure 4 This is a structural view of the side repair plate installation device for the large structural member lifting arm.

[0021] The numbers in the figure represent:

[0022] 1-lifting arm; 2-arc repair plate; 3-side repair plate; 4-fixing frame; 5-support frame; 6-positioning frame; 11-first fitting surface; 12-second fitting surface; 13-R angle segment; 41-fixing rod; 42-connecting rod; 51-support rod; 52-reinforcement rod; 61-bottom positioning plate; 62-first side positioning plate; 63-second side positioning plate; 64-top pressure positioning plate; 65-first mounting push rod; 66-second mounting push rod. DETAILED DESCRIPTION

[0023] The above and other technical features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.

[0024] Example 1

[0025] The present invention achieves structural strengthening by welding an arc repair plate 2 and a side repair plate 3 at corresponding positions of the lifting arm 1, and wrapping and repairing the R-angle section 13 of the lifting arm 1 that is prone to cracks by the arc repair plate 2 and the side repair plate 3, thereby improving the service life of the lifting arm 1 after repair, avoiding the situation where the lifting arm 1 is replaced with a new one or the service life is reduced by only welding crack repair. The lifting arm 1 is provided with a first fitting surface 11 and a second fitting surface 12, and the first fitting surface 11 and the second fitting surface 12 transition through the arc of the R-angle section 13. The arc repair plate 2 is fitted and connected to the first fitting surface 11 and the second fitting surface 12 and covers the R-angle section 13. The side repair plates 3 are provided on both sides of the arc repair plate 2 and fit and connect to the vertical side surface of the lifting arm 1 and cover the side surface of the R-angle section 13, thereby achieving wrapping and repairing the R-angle section 13.

[0026] like Figures 1 to 4 As shown, Figure 1 A three-dimensional structural view of the side repair plate installation device for the large structural member lifting arm during installation; Figure 2 A front view of the structure of the side repair plate installation device for the large structural member lifting arm during installation; Figure 3 A three-dimensional structural view of the side repair plate installation device for the large structural member lifting arm when positioning the side repair plate; Figure 4 This is a structural view of the side repair plate installation device for the large structural member lifting arm.

[0027] The side repair plate installation device for the lifting arm of a large structural member described in the present invention includes a fixing frame 4, a supporting frame 5 and a positioning frame 6. The fixing frame 4 includes a fixing rod 41 and a connecting rod 42. The connecting rod 42 is vertically fixed to the fixing rod 41. The fixing rod 41 is horizontally placed on the lifting arm 1, and at least one connecting rod 42 is provided on both sides of the lifting arm 1. The supporting frame 5 is fixedly connected to the connecting rod 42. The positioning frame 6 is fixedly connected to the connecting rod 42 and the supporting frame 5. The positioning frame 6 positions the side repair plate 3 so that the side repair plate 3 is accurately placed corresponding to the side of the R angle segment 13.

[0028] A side repair plate 3 is provided on both sides of the lifting arm 1, and a positioning frame 6 is provided on both sides of the corresponding lifting arm 1. The positioning frame 6 is arranged in a one-to-one correspondence with the side repair plate 3, and the positioning frame 6 is used to perform precise positioning operations on the corresponding side repair plate 3 before welding.

[0029] Specifically, the support frame 5 includes a support rod 51 and a reinforcement rod 52. The support rod 51 is vertically fixed on the connecting rod 42. The reinforcement rod 52 is arranged below the support rod 51 and the two ends of the reinforcement rod 52 are respectively connected to the support rod 51 and the connecting rod 42, thereby stably supporting the positioning frame 6.

[0030] The positioning frame 6 includes a bottom positioning plate 61, a first side positioning plate 62, a second side positioning plate 63 and a top pressure positioning plate 64. The bottom positioning plate 61 is horizontally arranged on the support rod 51, and the bottom positioning plate 61 is arranged corresponding to the bottom of the side repair plate 3, and is used to support and position the lower edge of the side repair plate 3.

[0031] The first side positioning plate 62 and the second side positioning plate 63 are respectively arranged on both sides of the side repair plate 3, the first side positioning plate 62 is fixedly set on the connecting rod 42, and the second side positioning plate 63 is fixedly set on the bottom positioning plate 61, and the first side positioning plate 62, the second side positioning plate 63 and the bottom positioning plate 61 are all arranged vertically, and the first side positioning plate 62 and the second side positioning plate 63 respectively perform positioning operations on both sides of the side repair plate 3.

[0032] Preferably, the first side positioning plate 62 and the second side positioning plate 63 are arranged in parallel, thereby ensuring that both sides of the side repair plate 3 are vertically fitted with the first side positioning plate 62 or the second side positioning plate 63, so as to improve the positioning effect of the first side positioning plate 62 and the second side positioning plate 63 on the side of the side repair plate 3.

[0033] The top pressure positioning plate 64 is vertically fixed on the bottom positioning plate 61, and the top pressure positioning plate 64 is vertically arranged with the fixing rod 41. An adjustment gap is arranged between the top pressure positioning plate 64 and the lifting arm 1, and the side repair plate 3 is arranged between the top pressure positioning plate 64 and the lifting arm 1. A first adjustment hole is provided on the top pressure positioning plate 64, and the first adjustment hole is set as a threaded hole. The first mounting push rod 65 is connected to the inner thread of the first adjustment hole. The first mounting push rod 65 is vertically arranged with the top pressure positioning plate 64. By rotating the first mounting push rod 65, one end of the first mounting push rod 65 can be pressed against the side repair plate 3 to fit the side repair plate 3 tightly with the lifting arm 1.

[0034] Preferably, at least two first adjustment holes are provided on the same pressing and positioning plate 64 , and the first mounting push rods 65 in the two first adjustment holes are arranged in parallel, thereby achieving stable pressing and positioning of the side repair plate 3 .

[0035] A second adjustment hole is provided on the second side positioning plate 63, and the second adjustment hole is set as a threaded hole. The second adjusting hole is threadedly connected to a second mounting push rod 66. The second mounting push rod 66 is vertically arranged to the second side positioning plate 63. By rotating the second mounting push rod 66, one end of the second mounting push rod 66 can be pressed against the side edge of the side repair plate 3, so that the first side positioning plate 62 is used as a reference surface for side positioning. The pressing operation of the second mounting push rod 66 realizes the close fit between the side repair plate 3 and the first side positioning plate 62, thereby ensuring the accurate position of the side repair plate 3.

[0036] Through the pressing structure setting of the second side positioning plate 63, a larger gap is set between the first side positioning plate 62 and the second side positioning plate 63, which facilitates the placement of the side repair plate 3 between the first side positioning plate 62 and the second side positioning plate 63.

[0037] Preferably, the bottom positioning plate 61 , the first side positioning plate 62 , and the second side positioning plate 63 are arranged in contact with and in close contact with the lifting arm 1 , thereby ensuring that the installation position of the present invention on the lifting arm 1 is stable.

[0038] It is worth noting that an installation gap is set between the bottom positioning plate 61, the first side positioning plate 62, the second side positioning plate 63 and the lifting arm 1, and the installation gap is smaller than the thickness of the side repair plate 3, thereby facilitating the installation of the present invention on the lifting arm 1 while also ensuring the precise positioning effect of each positioning plate on the side repair plate 3.

[0039] The present invention ensures that the side repair plate 3 is accurately placed on the lifting arm 1, so that the side repair plate 3 and the arc repair plate 2 can stably process and repair the R-angle section 13 of the lifting arm 1 that is prone to cracks, thereby increasing the service life of the lifting arm 1 after repair, avoiding the waste of resources caused by the replacement of the lifting arm 1 and the low service life caused by only welding crack repairs.

[0040] Example 2

[0041] The repair method for the lifting arm of a large structural member of the present invention is to first place the arc repair plate 2 horizontally on the upper surface of the box crossbeam of the lifting arm 1, and then horizontally set the fixing rod 41 on the upper surface of the arc repair plate 2. After determining the position, the connecting rod 42 is welded and fixed to the vertical side plate of the lifting arm 1, and the side repair plate 3 is placed on the bottom positioning plate 61 accordingly. The side repair plate 3 is simultaneously set between the first side positioning plate 62 and the second side positioning plate 63, and between the top pressure positioning plate 64 and the lifting arm 1. By adjusting the second side positioning plate 62 and the second side positioning plate 63, the top pressure positioning plate 64 and the lifting arm 1 are adjusted. The first mounting push rod 65 and the second mounting push rod 66 adjust the position accuracy of the side repair plate 3 and finally lock the position. The side repair plate 3, the vertical side plate of the lifting arm 1 and the arc repair plate 2 are assembled and fixed and welded. After the fixed welding is completed, all the fillet welds pass the UT and MT inspections. If there are no defects in the welds, the fixing frame 4, the supporting frame 5 and the positioning frame 6 are removed. The side repair plate 3 passes the on-site actual sample inspection and acceptance and fully meets the design and installation requirements. It is delivered for use and has undergone periodic continuous casting machine large package turntable operation inspection to achieve the mechanical performance effect.

[0042] The repair method for the lifting arm of a large structural component described in the present invention is not only safe and easy to operate, but also has stable welding quality and low investment costs, meets actual on-site needs, has high work efficiency, and greatly reduces maintenance costs and reduces losses caused by long-term downtime, providing a guarantee for reasonable production.

[0043] The above description is merely a preferred embodiment of the present invention and is intended to be illustrative rather than restrictive of the present invention. Those skilled in the art will appreciate that many changes, modifications, and even equivalents may be made to the present invention within the spirit and scope of the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A side repair plate installation device for a large structural member lifting arm, characterized in that: The lifting arm is provided with a first fitting surface and a second fitting surface, wherein the first fitting surface and the second fitting surface transition through the circular arc of the R-angle segment to be repaired, and the side repair plates are provided on both sides of the circular arc repair plate and are fitted and connected to the vertical side surfaces of the lifting arm and cover the side surfaces of the R-angle segment; The side repair plate installation device for the lifting arm of a large structural member includes a fixing frame, a supporting frame and a positioning frame, the fixing frame includes a fixing rod and a connecting rod, the connecting rod is vertically fixed to the fixing rod, the fixing rod is horizontally placed on the lifting arm, and at least one connecting rod is provided on both sides of the lifting arm, the supporting frame is fixedly connected to the connecting rod, and the positioning frame is fixedly connected to the connecting rod and the supporting frame; A side repair plate is provided on both sides of the lifting arm, and a positioning frame is provided on both sides of the corresponding lifting arm. The positioning frames are arranged in a one-to-one correspondence with the side repair plates, and the positioning frames are used to perform positioning operations on the corresponding side repair plates before welding.

2. The side repair plate installation device for a large structural member lifting arm according to claim 1, characterized in that: The support frame includes a support rod and a reinforcement rod. The support rod is vertically fixed on the connecting rod. The reinforcement rod is arranged below the support rod and two ends of the reinforcement rod are respectively connected to the support rod and the connecting rod.

3. The side repair plate installation device for a large structural member lifting arm according to claim 2, characterized in that: The positioning frame includes a bottom positioning plate, which is horizontally arranged on the support rod and corresponds to the bottom of the side repair plate, and is used to support and position the lower edge of the side repair plate.

4. The side repair plate installation device for a large structural member lifting arm according to claim 3, characterized in that: The positioning frame also includes a first side positioning plate and a second side positioning plate, the first side positioning plate and the second side positioning plate are respectively arranged on both sides of the side repair plate, the first side positioning plate is fixedly set on the connecting rod, and the second side positioning plate is fixedly set on the bottom positioning plate, and the first side positioning plate, the second side positioning plate and the bottom positioning plate are all arranged vertically, and the first side positioning plate and the second side positioning plate respectively perform positioning operations on both sides of the side repair plate.

5. The side repair plate installation device for a large structural member lifting arm according to claim 4, characterized in that: The first side positioning plate and the second side positioning plate are arranged in parallel.

6. The side repair plate installation device for a large structural member lifting arm according to claim 4, characterized in that: The positioning frame also includes a top pressure positioning plate, which is vertically fixed to the bottom positioning plate, and the top pressure positioning plate is vertically arranged with the fixing rod. An adjustment gap is arranged between the top pressure positioning plate and the lifting arm, and the side repair plate is arranged between the top pressure positioning plate and the lifting arm. A first adjustment hole is provided on the top pressure positioning plate, and the first adjustment hole is set as a threaded hole. A first mounting push rod is connected to the inner thread of the first adjustment hole. The first mounting push rod is vertically arranged with the top pressure positioning plate, and one end of the first mounting push rod can be pressed against the side repair plate by rotating the first mounting push rod.

7. The side repair plate installation device for a large structural member lifting arm according to claim 6, characterized in that: At least two first adjustment holes are provided on the same pressing and positioning plate, and the first mounting push rods in the two first adjustment holes are arranged in parallel.

8. The side repair plate installation device for a large structural member lifting arm according to claim 6, characterized in that: A second adjustment hole is provided on the second side positioning plate, and the second adjustment hole is set as a threaded hole. A second mounting push rod is threadedly connected to the second adjustment hole. The second mounting push rod is vertically arranged to the second side positioning plate. By rotating the second mounting push rod, one end of the second mounting push rod can be pressed against the side edge of the side repair plate.

9. A method for repairing a lifting arm of a large structural member, characterized in that: The side repair plate installation device for the lifting arm of a large structural member as described in claim 7 or 8 is used, and the arc repair plate is first placed horizontally on the upper surface of the box crossbeam of the lifting arm, and then the fixing rod is horizontally set on the upper surface of the arc repair plate, and after determining the position, the connecting rod is welded and fixed to the vertical side plate of the lifting arm, and the side repair plate is placed accordingly on the bottom positioning plate, and the side repair plate is simultaneously arranged between the first side positioning plate and the second side positioning plate, and between the top pressure positioning plate and the lifting arm, and the position accuracy of the side repair plate is adjusted by adjusting the first mounting push rod and the second mounting push rod and finally locked in position, and the side repair plate, the vertical side plate of the lifting arm and the arc repair plate are assembled and fixed and welded after completion, and after the fixed welding is completed, all corner welds pass the flaw detection, and if there are no defects in the welds, the fixing frame, the support frame and the positioning frame are removed, and the side repair plate passes the on-site actual sample inspection and acceptance and fully meets the design and installation requirements, thereby completing the repair operation.

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